Steam-boiler.



M. R. COLBY.

STEAM BOILER.

APPLICATION FILED 020.27.1915.

Patented Apr. 3, 1917.

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M. R. COLBY.

STEAM BOILER.

Patented Apr. 3, 1917.

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STEAM-BOILER.

Specification of Letters Patent.

Patented Apr. 3, 1917.

Application filed December 27, 1915. a Serial No. 68,954.

To all whom it may concern.

Be it known that I, MARK R. COLBY, a citizen of the United States, and a resident of the city of Portland, Multnomah county, State of ()regon, have invented a new and useful Improvement in Steam-Boilers, of which the following is a specification.

This invention relates generally to steam boilers and refers particularly to improvements in the construction of combination fire and water tube boilers of the horizontal type.

One of the main objects of my invention is to construct an improved boiler of this type in which the following features will be embodied: All fiat, stayed, water legs and circulating members are eliminated; all hand and man-hole openings for water tubes, all headers, all riveted surfaces and the feed and blow-01f pipes and fittings are located outside the furnace and are not subject to the action of furnace flame or gases. The arch return water tubes at the rear of the water-tube section connect with the shell of the fire-tube section approximately at the plane of the upper bank of fire tubes, which arrangement of circulation members promotes a more eflicient circulation. Furthermore, the elements of the water-tube section are so chosen that they may be shipped in a convenient dissembled form.

In the accompanying drawings,

Figure 1 is a longitudinal, vertical section of a furnace, showing my improved boiler used therewith, the latter being partly broken away so as to illustrate certain details of interior construction;

Fig. 2 is a transverse, vertical section of the boiler taken approximately on the line 2-2 of Fig. 1;

Fig. 3 is a similar view taken on the line 33 of Fig. 1; and

Fig. 4 is a larger-scaled sectional detail of construction.

In Fig. 1, I have illustrated my boiler as used with a standard type of setting, although it is to be understood that the same may also be used with any other setting. In this construction, the front wall, a, of the furnace is provided with fire doors I) and ash-pit doors 0. d are the side walls, e the rear walls in which is a clean-out door 7, and f is a rear arch. The lateral wing walls which inclose the rear end of the boiler are indicated by g, and the furnace roof is represented by h. The usual bridge wall is shown by 2', and j are the grates.

The fire-tube section comprises the boiler shell is which is provided with the usual feed pipe Z, steam and pop nozzles m, a, the fire tubes 0, and the smoke box 20. Said shell is supported in the straps g, which are hung from the overhead transverse beams 1', the latter being supported on the vertical columns s. This type of suspension is well known and forms no part of my invention.

The parts thus far enumerated represent features that are well known to anyone skilled in the art of steam boiler work and are not detailed herein. Furthermore, it is to be understood that any other standard fit ting or accessory usually used in connection with a boiler of this type, and not shown herein, may be regarded as having been omitted in the drawings as being immaterial to the invention involved.

Referring to Fig. 2, t represents a cylindrical drum provided with a removable head u and a plurality of hand-holes o, the latter being located in the front portion of said drum exterior of the front wall, a, of the furnace, which is built up around the lower and rear portions of said drum. In the drawings the hand-hole closures are omitted. The drum t is located beneath the forward end of the shell 70 and lateral with respect to the longitudinal axis of the latter. A plurality of cylindrical conduits to, w and y, located in a vertical plane above the drum t, connect the latter with the lower portlon of the shell is.

Mounted in the rear wall, 0, of the setting is a cylindrical drum 2, parallel to the header t, but in a higher horizontal plane and spaced from the rear head of the boiler shell la. The drum 2 is provided at one end, exterior of the furnace wall 0, with a man hole 4:. The rear drum 2 is also mounted on roller bearings 9, and compressible packing 10 between the header and the rear wall 6 permits the expansion of the members, due to heat, without placing any undue stress in the members. A bank of parallel water tubes 5 connect the drums t, 2, said tubes being located beneath the roof h of the furnace. Arch water tubes 6 connect the drum 2 with the rear head of the boiler shell is, the points of connection lying approxiof the ci'r'culationsystem, lateral headers 7 mately in the plane of the upper bank of fire-tubes. These arched tubes also form a support for the reararch f.

In order to provide for the use of drums longer than the diameter of the boiler shell,

thus'increasing the capacity of the water- 7 tube section without decreasing the efficiency are fixed on the' sides of the boiler shell in the position shown in Fig. 3, and the outer arch water tubes 6 connect with said headers. The latter are in constant communication with the interior of the shell and form an extension thereof. Hand-hole plugs 8 are provided in the forward side of the headers and are exterior of the wing-walls g.

It is to be noted that the arch water tubes 6 connect with the boiler'shell lcat points in the horizontal plane of the top bank of fire tubes. For the purpose of rendering the water and fire tubes readily distinguishable from each other in Figs. 2 and 3, the

surfaces are outside of the furnace and are 1 therefore not subject to the deteriorating action of the flame and gases of the furnace. The circulatory system is facilitated by connecting the arch water tubes to the boiler shell at a point just below the water line,

which affords an easy liberation to the steam, and at the same time results in the production of dry steam by obviating the passage of the steam through a large body of water before reaching the steam space.

I claim:

1. In a boiler of the type described having an upper fire-tube section, the combination with said fire-tube section of a lower water-tube section comprising a transversely disposed drum located beneath the front end of said fire-tube section and spaced therefrom a drum located at the rear end of the fire-tube section, said drums having greater length than the diameter' of said fire-tube section, said lower water tube sect-ion connecting said drums along their full length and extending longitudinally beneath said fire-tube section, a connection between the lower portion of said fire-tube section and the forward drum, extension headers projecting laterally from the rear end of the fire-tube section and being in direct communication therewith, and arched water tubes connecting said rear drum with the fire-tube section approximately at the plane of the upper row of the fire tubes, the outer of said arched water tubes connecting with said extension headers.

2. In a boiler of the type described having'an upper fire-tube section, the combiii'ation with said fire-tube section of a lower water tube section comprising a transversely disposed drum located beneath the front end of said fire-tube section and spaced therefrom, a drum located at the rear end of the fire-tube section, said drums having greater length than the diameter of said fire-tube section, said lower water tube section connecting said drums along their full length and extending longitudinally beneath said fire-tube section, independent conduits connecting the lower portion of said fire-tube section with the forward drum, extension headers projecting laterally from the rear end of the fire-tube section and being in direct communication therewith, and arched water tubes connecting said rear drum with the fire-tube section approximately at the plane of the upper row of the fire tubes, the outer of said arched water tubes connecting with said extension headers.

MARK R. COLBY.

Copies of this patent may be obtained for five cents each, by addressing the"commissioner of Patents.

Washington, D. G. 

